Calling an Oracle stored procedure in Java

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Calling an Oracle stored procedure
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After you understand how the package and its stored procedure works, you can call it from ColdFusion by using the code in Listing 10-25.
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Listing 10-25: Calling sp_GetCompaniesEmployees from ColdFusion
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<cfstoredproc procedure= pkg_CompaniesEmployees.sp_GetCompaniesEmployees datasource= CFMXBible > <cfprocparam type= In cfsqltype= CF_SQL_VARCHAR dbvarname= vState value= GA null= No > <cfprocparam type= In cfsqltype= CF_SQL_VARCHAR dbvarname= vName value= M null= No > <cfprocresult name= GetCompanies resultset= 1 > <cfprocresult name= GetEmployees resultset= 2 > </cfstoredproc>
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This listing may seem a little confusing at first, but we can explain it.
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The name of the stored procedure that you re calling is sp_GetCompaniesEmployees, which is contained within the Oracle package pkg_CompaniesEmployees. You employ the familiar dot notation used in most languages for accessing subordinate elements (for example, Parent.Child) to call sp_GetCompaniesEmployees, as follows:
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<cfstoredproc procedure= pkg_CompaniesEmployees.sp_GetCompaniesEmployees datasource= CFMXBible >
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Now take a look at the following two input parameters:
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<cfprocparam type= In cfsqltype= CF_SQL_VARCHAR dbvarname= vState value= GA null= No > <cfprocparam type= In cfsqltype= CF_SQL_VARCHAR dbvarname= vName value= M null= No >
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You may have noticed that these parameters are defined as CF_SQL_VARCHAR, even though they match up with CHAR data types in the Oracle stored procedure. This is done to circumvent a problem that sometimes crops up if you try to send CF_SQL_CHAR input parameters into an Oracle stored procedure that also uses CHAR data types, in that they often fail to produce expected results. The way around this problem is to still use the CHAR data types in your Oracle stored procedure but specify the input parameters in your CFPROCPARAM tags as CF_SQL_VARCHAR. And there you have it! If you want to make use of the two result sets in ColdFusion, you do so as if they were two regular query objects returned from two separate CFQUERY calls, as in Listing 10-26.
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Listing 10-26: Using multiple result sets from an Oracle stored procedure
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<h1>Companies</h1> <table cellspacing= 2 cellpadding= 2 border= 1 > <tr> <td><b>Company Name</b></td> <td><b>Zip Code</b></td> </tr> <cfoutput query= GetCompanies > <tr> <td>#CompanyName#</td> <td>#ZipCode#</td> </tr> </cfoutput>
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Listing 10-26 (continued)
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</table> <h1>Employees</h1> <table cellspacing= 2 cellpadding= 2 border= 1 > <tr> <td><b>Firstname</b></td> <td><b>Lastname</b></td> </tr> <cfoutput query= GetEmployees > <tr> <td>#Firstname#</td> <td>#Lastname#</td> </tr> </cfoutput> </table>
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In fact, you may notice that Listing 10-26 is identical to Listing 10-14, which calls an SQL Server stored procedure that returns these same result sets. You find no difference at all in the way that different database platforms result sets are used. The preceding example was a simple one containing only two user-defined data types and one stored procedure, but a single Oracle package can contain many stored procedures, functions, and user-defined data types. Oracle packages are one of the platform s most powerful features, and their capabilities go far beyond what is mentioned here. If you are interested in leveraging the power of Oracle packages then head for your local bookstore.
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Note Using multiple result sets from Oracle stored procedures in ColdFusion 5 requires an unusual treatment of the CFSTOREDPROC call. If you are still using ColdFusion 5 and want to make use of multiple result sets in Oracle stored procedures, please e-mail us at adam@ProductivityEnhancement.com, and we ll send you detailed instructions.
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Important notes about Oracle stored procedures
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You need to keep in mind a few special considerations in writing Oracle stored procedures. The following sections don t give you a comprehensive list, by any means; they provide only a short list of the notes that we have found most useful over the years.
Strongly typing cursor variables to compile before runtime
Strongly typing your cursor variables is important, as follows:
TYPE curCompanies IS REF CURSOR RETURN recCompany;
If a cursor variable is strongly typed (i.e., its data dimension is explicitly declared), Oracle can catalog the definition of this data type and at compile time perform a compatibility match between the data type and any record or table row that either uses or is used by the cursor. Suppose that the REF CURSOR is weakly typed (i.e., its data dimension is not explicitly declared), as follows:
TYPE curCompanies IS REF CURSOR;
The cursor variable in this example can reference any cursor of any column structure. This flexibility comes at a price, however, because Oracle must check this weakly typed